The ages of the 112 people who live on a tropical island are grouped as follows. Calculate the modal age (correct to the nearest whole number) of the distribution.

Age (years)	Frequency
0 - 19	39
20 - 39	41
40 - 59	21
60 - 79	10
80 - 99	1

Select one:

21 years

22 years

30 years

20 years